Lowrey



Oct. 20, 1953 A. LowREY POWER ACTUATED ADJUSTABLE TIRE DEMOUNTING BAR med April s, 195o 2 Sheets-Sheet l AMW I IINN INVENTOR. @y Lon/rey,

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A. LOWREY POWER ACTUATED ADJUSTABLE TIRE DEMOUNTING BAR Filed April '3, 1950 o ct.. 2o, 1953 2 sheets-sheer 2 JNVENToR. ,Au ZfyLon/vaey, BY

Patented Oct. 20, 1953 OFFICE POWER ACTUATED .ADJUSTABLE TIRE DEMOUNTING BAR Aubrey Lowrey, Shreveport, La.

Application April 3, 1,950, Serial N o. 153,599

(C1. IS7-1.17)

3 Claims.

This invention relates in general to a power actuated adjustable tire demounting bar particularly adapted for use in connection with heavy truck tires and the like.

Whereas the copending application of Lowrey and Morris, Serial No. 102,988, relates especially to a lock ring apparatus, the present invention more especially has to do with the removal of the pneumatic rubber tire from a wheel rim after the movable flange and the locking ring of such tire have been removed.

One important object of this invention is to provide a device of this character wherein those parts of the apparatus requiring manual adjust ment nvill be so constructed as to be within the manual capacity of one man.

Another object of the invention is to provide a tire demounting stand wherein the supporting means for a rim and tire will lie close to the ground, again effecting a saving in manual labor.

It is well known that after a tire has been in use on a wheel rim for a considerable time the rubber of the tire adheres strongly to the rim and especially where it contacts the xed ange of such a rim.

A further object of this invention is to provide a tire demounting device in which novel means are provided to break the adhesive between rubber and metal in an adhering tire.

A still further object of this invention is to provide adhesion breaking means for the foregoing purpose wherein the breaking means may be moved step-by-step around the tire.

With the above and other objects in view, as will be presently apparent, the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawings and particularly claimed.

In the drawings, like characters of reference indicate like parts in the several views, and

Figure l is a plan view if this invention and showing a partially broken away tire and a rim located on the stand;

Figure 2 is a section on the line 2-2 of Figure 1, and

Figure 3 is a detail section on the line 3 3 of Figure 2.

In the. embodiment of the invention as shown in the drawings there is provided a cylinder it preferably mounted on short legs II. |This cylinder is integrally closed at its bottom. The upper end of the cylinder is closed by a head I2 secured in place by bolts I3. A gasket I4 rests on top of the cylinder wall and the head I2 seats on this gasket, thus rendering the cylinder fluid tight.

lower head member I5 and an upper head member I6. The lower member I5 is provided at its upper edge with a rabbet I', and an angled packing strip I8 surrounds the member i5 and has an internal flange resting in the rabbet. The upper member I6 is surrounded peripherally by a packing strip i9 having an internal flange underlying the member I6. Between the flanges of the packing strips I8 and I9 is tted a gasket 26. Bolts 2I, of which only one is shown, connect the members I5 and I5 and cause a compression of the packing strips so that a uid tight joint is formed between the piston and the inner surface of the cylinder wall. Centrally of the member' I5 is a boss 22 of suiicient height to prevent contact between the body of the member I6 and the head I2. This boss 22 has an opening 23 extending through its center. Centrally of the member I5 is an upwardly opening and threaded pocket 24. Screwed into this pocket is the lower end of a tubular piston rod 25 which extends upwardly through the boss 23. Centrally of the head I2 is a stuiiing box 26 having the usual gland 21 and packing 28 and the rod 25 extends upwardly through this structure. Rotatably mounted in the hollow rod 25 is a swivel rod 29 having a head 3S on its lower end which rests against the lower end of the rod 25 in the pocket 24. At the upper end of the swivel rod 29 is formed an eye 3i to which is connected one end of a chain 32 having links of uniform shape and size. On the head I2 is formed a triad of short ribs 32 which radiate from the box 26 and have steps 33 on their upper edges. Also long ribs 34 are formed on the head i2 and project beyond the periphery of said head. These long ribs radiate from the box 26 and each has a single step or notch 35 at its outer end and a series of steps 36 at the portion adjacent the box 26. The steps 33 and 36 serve to support the hubs of wheels being handled on this device when desirable. Alsoy the short ribs 32 and the long ribs 34 act to reinforce head I2. In the head I2 is formed a port 31 and the bottom of the cylinder has a port 38. These ports have pipes 39 connecting with a suitable control valve dil the structure of which may be of commercial y type and thus not necessary here to detail. The

Within the cylinder is a piston including a valve il!) is supplied with fluid under pressure as by the pipe 4I and may exhaust through a port 42. In one position of the valve iiuid under pressure will be admitted above the piston and exhausted from below the piston while in ano-ther Y position of the valve the admission will be below and the exhaust above the piston.

The operating bar or lever consists of a structure having a pair of elongated sides 43 held in parallel spaced relation by integral cross pieces loosely relative to the top and bottom edges of the sides 43. Extending -downwardly from this sleeve 41 is a rib 48 which projects =at` its.v

ends beyond the sides of the sleeve. Extending transversely of each end of the rib489is-a'foot 49. In order to hold the fulcrummember46in adjusted position on the bar a lbolt '51)pa'ss`es through a selected pair of the openingsi-and.

through the sleeve 46. Extending downwardly yfrom the cross-piece 44 .adjacent `the opposite endof the operating 'bar is fa pusher blade 5l the ilower portion of which curves vtoward-the `fulcr-um member '46 vand is tapered Ito Y,present 4a vsomewhat knife-edge construction as at l52. .A brac'efbar 53 extends fromthe lcurved portion '52 substantially in alinement to the 'knife-likefedge and is secured between the sides 43 by-abolt'54.

Centrally ofthe length yof the presser Ybar its sides 43 are provided on their upper edges with spaced notches 55, the -notches in Yone side -43 being alined opposite those'onfthe other side43.

'Ihu'swt'hel presser bar is provided with pairs of o notches 'spaced longitudinally of said bar. AOn

the sides 43 is mounted a saddle indicated in .general .at 56. This saddle is a rectangular structure having side walls l5l and' end walls-5B.

The sidewalls rest on Athe bar sides 43 and the end walls span the space between thebar sides. One of the end'walls 578 is `provided on its lower edge rwith a rounded edge 59 selectively -engageable V:in the pairs of notchesl. .Lugs 60 extend downwardly 'from' Vthe saddle 56 and engage against adjacent vsides f4.3 'of Ythe presser bar to keep the saddle from moving sideways. Between ther-saddle sides 51 extends a U-shaped slotted chain grip '6| having Aits sides so spaced as to ,permit a link of the chain w32 to pass .into the `s1ot=of the .grip in one position and vhold the chain :linksfromi passing down between. thel clamp sides.

In connection with -th'e above described vapparatus there yhas been shown Ain the drawings a wheel rim'62 having a tire =63 thereon, the tire having -'engagement with .the `fixed. lange'nll .of the wheel rim. Also, the removable flange 65 and locking rim 66 are shown, dotted or broken lines being Aused to indicate that theparts -65 and 66 .havebeen removed. The rim :62 Vis shown .as being-of the largest size Vwhich can be carried .byvan apparatus of the comparativesizre :indicated, butit will be understood that larger and `Smaller rims and wheel centers'can be provid-ed 'for Without changing any 'structural arrangement but only by changing'sizesandproportions.

fAs shown, the rim .'62 is seated 4on the three S'stepsis'; The :presser bar or 'lever .is vthen .posi- -tioned so that the curved end52 of thepartfl Tests on the side of the tire63, the knife edge .of '.the curved end being positioned .to Yenter 'the crack between Athe fixed 'iiangef and the tire T63. The ful'crum member 46 is then adjusted such lmanner Athat the forward :ends vof the :feet 49 'rest on the Vrim flange 64 wlhile the frearrends of these feet rest on the side wall *of the tire. The bolt .50 Ythen :passed through .the sidesof the `sleeve 4f1=and an :appropriate pair-fof -openings' 45. `Fluid =having been :applied to the cylin- 4 der I0 below the piston, the piston rod assumes its highest position. The saddle is now adjusted so that the chain grip lies closer to the part 5l than does the top of the swivel rod 29. The free end of the chain 32 is then passed up through the saddle', is drawn taut 'and engages in the 'chain grip. Theichain-willi thus beA inclined as in Figure 2. Upon pressure being brought on top Iof the piston the rod 25 will be retracted. This will not only pull... the lever bar down but will -causeitfto move `bodily towards the right of Figure 2 so that the knife edge of the part 52 is .force 'between the tire and the rim flange 64.

The piston will now be raised, the attachment of the hainto'thesaddle shortened and the piston againdepressed. This sequence of movements is kept up until the tirey has been pushed completel-y .01T :the rim, the presser barV being shifted aroundY the rim and tire from l.time .to time `between the pushng steps.

While there is herein .shown-and described the preferred embodiment of the. invention,l r`it, is nevertheless to be understood that-minor-changes may be made therein :without vdeparting from-.the spirit and scope of the invention .as.claimed.

What-is claimed is.:

1. In a demounting stand-.for.pneumatictires a pneumatic cylinder havingtpressure .actuated means therein, a piston rod:extendingupwardly from said means, supporting rmeans `carried YAby the upper end of said-.cylinder `for.supportinga wheel rim, a chain havingbne'en'd connected to said piston rod, a presser bar 4forminga levenfa saddle mounted on `the tlever intermediate .the ends thereof and.havingmeans f or selectively .engaging the links of Vsaid `chain and being adj-ustable longitudinallyA vof .the lever, `cooperating means Yon the saddle and lever for :holding vrthe saddle in 'adjusted position, .a .fulcrum device loosely and adjustably.pivotallyzmounted onfone end of the-lever topermitrocking of'theiulcrum device on the lever and a pusher device depending fromY the other nend kof :said lever anddncluding a vrib extending downwardlyvfrom .said .lever with Ythe ylower fend portion thereof curved .toward the middle of `thelever andtaperedfto .form a knifeedge.

`2. Al demounting Astand asin 1claim TJ., wherein the means for holding thesaddlein.adiustedposition includes .notches in Athe .upper A,side -.o`f the lever and a. cross pin `on `the saddle `selectively receivablein-thenotches.

v`3. Ademountmgstandas inclaim. 1 wherein .the .fulcrum -device includes ra Floose sleeve ex,-

`tending .around .the lever, said sleeve having aligned pin-receiving opening-s, v.a .pin vextended through said openings and through a .selected one of .aplurality of .openings insaid :lever :and

.attire-andv rim engaging--footbarried by the lower side ofthe sleeve. 

